babits I just kinda wanna see this thing solved now.http://www.fantasticcontraption.com/?designId=11770845
here's where I got
An idea for a rectangle pult would be just a normal pult (which could be deflected by the lower brown thing on the ball poker) which the weight could fall off for and be used as the weight for the bridge/pult thing on the bottom. Which then falls off and is used as that last and very clever ball catapult. I'm bad at getting the rectangle out but I'll tweak it a bit more and see if I can come up with anything.
Also, with that design, we have 20ish pieces left. Considering that everything is built with the exception of a 10 piece catapult for which we already have a weight, I think this is entirely possible with the right tweak.
The first weight would be the rectangle retriever, dynamic pusher, and ball retriever which will also need some kind of bridge which I'm not too worried about.
The other weight is the rectangle pult, ball pult, and second ball pult.
If someone is really clever they can think of a way to knock the bottom out from the dynamic and use that as a weight too! that may make tweaking easier, although it would get in the way of the second ball pult.
Okay that's it for my ideas,
feel free to tweak